Refactoring installer shortcut deletion; adding dedicated shortcut update feature.

chrome/installer/setup/install.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/installer/setup/install.h"
 
 #include <windows.h>
 #include <shlobj.h>
 #include <time.h>
 
@@ skipping 243 matching lines @@
       ShellUtil::SYSTEM_LEVEL : ShellUtil::CURRENT_USER;
   base::FilePath uninstall_shortcut_path;
   ShellUtil::GetShortcutPath(ShellUtil::SHORTCUT_LOCATION_START_MENU, dist,
                              shortcut_level, &uninstall_shortcut_path);
   uninstall_shortcut_path = uninstall_shortcut_path.Append(
       dist->GetUninstallLinkName() + installer::kLnkExt);
   file_util::Delete(uninstall_shortcut_path, false);
 
   if (installer_state.system_install()) {
     ShellUtil::RemoveShortcut(
-        ShellUtil::SHORTCUT_LOCATION_QUICK_LAUNCH, dist, chrome_exe,
-        ShellUtil::SYSTEM_LEVEL, NULL);
+        ShellUtil::SHORTCUT_LOCATION_QUICK_LAUNCH, dist,
+        ShellUtil::SYSTEM_LEVEL, chrome_exe);
   }
 }
 
 // Returns the appropriate shortcut operations for App Launcher,
 // based on state of installation and master_preferences.
 installer::InstallShortcutOperation GetAppLauncherShortcutOperation(
     const InstallationState& original_state,
     const InstallerState& installer_state) {
   const installer::ProductState* original_app_host_state =
       original_state.GetProductState(installer_state.system_install(),
@@ skipping 413 matching lines @@
   if (app_host_path.empty())
     return false;
 
   CommandLine cmd(app_host_path);
   cmd.AppendSwitchASCII(::switches::kInstallFromWebstore, app_code);
   VLOG(1) << "App install command: " << cmd.GetCommandLineString();
   return base::LaunchProcess(cmd, base::LaunchOptions(), NULL);
 }
 
 }  // namespace installer